Fire Prevention & Creosote Management Flashcards

Which component of wood smoke is primarily responsible for forming creosote deposits?

Answer: Unburned hydrocarbons, tar vapors, and moisture

Creosote forms when unburned hydrocarbons, volatile tar vapors, and water vapor cool and condense on the inner flue surfaces.

What is the correct immediate action if a homeowner calls to report an active chimney fire?

Answer: Advise them to call 911 immediately and evacuate the home

An active chimney fire is a life-safety emergency; residents should evacuate and call 911, as the fire can spread to the structure.

Which chimney liner material provides the best protection against high-temperature chimney fires?

Answer: UL-listed stainless steel liner rated for solid-fuel use

UL-listed stainless steel liners are tested and rated to contain chimney fires and withstand the extreme temperatures they generate.

A sweep discovers a 1/8-inch continuous crack running the length of a clay tile liner after a chimney fire. What is the appropriate recommendation?

Answer: Reline the entire flue before resuming use of the appliance

A continuous crack in a clay tile liner compromises containment; combustion gases and future chimney fire heat can breach the liner and enter the structure.

Why is a metal chimney cap considered a fire prevention device, not just a weather exclusion device?

Answer: The cap prevents burning embers from exiting the flue and igniting roof or nearby combustibles

A properly fitted chimney cap with spark-arrestor mesh prevents live embers from escaping the flue and landing on the roof, dry vegetation, or adjacent structures.

What is 'puffback' in the context of a chimney system, and why is it a fire hazard?

Answer: A partial ignition of creosote that produces explosive pressure reversals in the flue

A puffback occurs when accumulated combustible gases ignite in a pressure wave, which can blow soot and burning material into the living area.

Which measurement tool does a chimney sweep use to assess whether flue gas temperatures are in a creosote-safe range during a system evaluation?

Answer: A flue thermometer or temperature probe inserted into the flue collar

A flue thermometer measures the actual temperature of gases leaving the appliance, confirming whether they are high enough to minimize creosote condensation.